It is an unprimeable number.
Almost surely, 21566654816960 is an apocalyptic number.
1566654816960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1566654816960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2957681664000).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1566654816960 is a wasteful number, since it uses less digits than its factorization.
1566654816960 is an evil number, because the sum of its binary digits is even.
The spelling of 1566654816960 in words is "one trillion, five hundred sixty-six billion, six hundred fifty-four million, eight hundred sixteen thousand, nine hundred sixty".